syz-executor.1 (10026) used greatest stack depth: 24120 bytes left ====================================================== WARNING: possible circular locking dependency detected 4.14.277-syzkaller #0 Not tainted ------------------------------------------------------ kworker/1:4/9163 is trying to acquire lock: (&sb->s_type->i_mutex_key#21){+.+.}, at: [] inode_lock include/linux/fs.h:719 [inline] (&sb->s_type->i_mutex_key#21){+.+.}, at: [] __generic_file_fsync+0x9e/0x190 fs/libfs.c:989 but task is already holding lock: ((&dio->complete_work)){+.+.}, at: [] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2092 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 ((&dio->complete_work)){+.+.}: process_one_work+0x736/0x14a0 kernel/workqueue.c:2093 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 -> #1 ("dio/%s"sb->s_id){+.+.}: flush_workqueue+0xfa/0x1310 kernel/workqueue.c:2625 drain_workqueue+0x177/0x3e0 kernel/workqueue.c:2790 destroy_workqueue+0x71/0x710 kernel/workqueue.c:4116 __alloc_workqueue_key+0xd50/0x1080 kernel/workqueue.c:4093 sb_init_dio_done_wq+0x34/0x80 fs/direct-io.c:624 do_blockdev_direct_IO fs/direct-io.c:1287 [inline] __blockdev_direct_IO+0x3df1/0xdcb0 fs/direct-io.c:1423 blockdev_direct_IO include/linux/fs.h:2994 [inline] fat_direct_IO+0x19b/0x320 fs/fat/inode.c:275 generic_file_direct_write+0x1df/0x420 mm/filemap.c:2958 __generic_file_write_iter+0x2a2/0x590 mm/filemap.c:3137 generic_file_write_iter+0x36f/0x650 mm/filemap.c:3208 call_write_iter include/linux/fs.h:1780 [inline] aio_write+0x2ed/0x560 fs/aio.c:1553 io_submit_one fs/aio.c:1641 [inline] do_io_submit+0x847/0x1570 fs/aio.c:1709 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb -> #0 (&sb->s_type->i_mutex_key#21){+.+.}: lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 down_write+0x34/0x90 kernel/locking/rwsem.c:54 inode_lock include/linux/fs.h:719 [inline] __generic_file_fsync+0x9e/0x190 fs/libfs.c:989 fat_file_fsync+0x73/0x1f0 fs/fat/file.c:165 vfs_fsync_range+0x103/0x260 fs/sync.c:196 generic_write_sync include/linux/fs.h:2684 [inline] dio_complete+0x561/0x8d0 fs/direct-io.c:330 process_one_work+0x793/0x14a0 kernel/workqueue.c:2117 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 other info that might help us debug this: Chain exists of: &sb->s_type->i_mutex_key#21 --> "dio/%s"sb->s_id --> (&dio->complete_work) Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock((&dio->complete_work)); lock("dio/%s"sb->s_id); lock((&dio->complete_work)); lock(&sb->s_type->i_mutex_key#21); *** DEADLOCK *** 2 locks held by kworker/1:4/9163: #0: ("dio/%s"sb->s_id){+.+.}, at: [] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2088 #1: ((&dio->complete_work)){+.+.}, at: [] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2092 stack backtrace: CPU: 1 PID: 9163 Comm: kworker/1:4 Not tainted 4.14.277-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: dio/loop4 dio_aio_complete_work Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1258 check_prev_add kernel/locking/lockdep.c:1905 [inline] check_prevs_add kernel/locking/lockdep.c:2022 [inline] validate_chain kernel/locking/lockdep.c:2464 [inline] __lock_acquire+0x2e0e/0x3f20 kernel/locking/lockdep.c:3491 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 down_write+0x34/0x90 kernel/locking/rwsem.c:54 inode_lock include/linux/fs.h:719 [inline] __generic_file_fsync+0x9e/0x190 fs/libfs.c:989 fat_file_fsync+0x73/0x1f0 fs/fat/file.c:165 vfs_fsync_range+0x103/0x260 fs/sync.c:196 generic_write_sync include/linux/fs.h:2684 [inline] dio_complete+0x561/0x8d0 fs/direct-io.c:330 process_one_work+0x793/0x14a0 kernel/workqueue.c:2117 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 attempt to access beyond end of device loop4: rw=1, want=17016, limit=16256 attempt to access beyond end of device loop4: rw=1, want=21112, limit=16256 attempt to access beyond end of device loop4: rw=1, want=25208, limit=16256 attempt to access beyond end of device loop4: rw=1, want=29304, limit=16256 attempt to access beyond end of device loop4: rw=1, want=32896, limit=16256 attempt to access beyond end of device loop4: rw=1, want=17016, limit=16256 attempt to access beyond end of device loop4: rw=1, want=21112, limit=16256 attempt to access beyond end of device loop4: rw=1, want=25208, limit=16256 attempt to access beyond end of device EXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue loop4: rw=1, want=29304, limit=16256 attempt to access beyond end of device loop4: rw=1, want=32896, limit=16256 EXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop1): mounted filesystem without journal. Opts: ,errors=continue qnx6: invalid mount options. mmap: syz-executor.1 (10458) uses deprecated remap_file_pages() syscall. See Documentation/vm/remap_file_pages.txt. qnx6: invalid mount options. ISO 9660 Extensions: Microsoft Joliet Level 0 qnx6: invalid mount options. ISO 9660 Extensions: Microsoft Joliet Level 0 ISO 9660 Extensions: Microsoft Joliet Level 0 print_req_error: I/O error, dev loop1, sector 0 print_req_error: I/O error, dev loop1, sector 0 Buffer I/O error on dev loop1, logical block 0, async page read print_req_error: I/O error, dev loop1, sector 0 Buffer I/O error on dev loop1, logical block 0, async page read print_req_error: I/O error, dev loop1, sector 0 Buffer I/O error on dev loop1, logical block 0, async page read print_req_error: I/O error, dev loop1, sector 0 Buffer I/O error on dev loop1, logical block 0, async page read print_req_error: I/O error, dev loop1, sector 0 Buffer I/O error on dev loop1, logical block 0, async page read print_req_error: I/O error, dev loop1, sector 0 Buffer I/O error on dev loop1, logical block 0, async page read ISO 9660 Extensions: Microsoft Joliet Level 0 ISO 9660 Extensions: Microsoft Joliet Level 0 qnx6: invalid mount options. ISO 9660 Extensions: Microsoft Joliet Level 0 qnx6: invalid mount options. ISO 9660 Extensions: Microsoft Joliet Level 0 qnx6: invalid mount options. ISO 9660 Extensions: Microsoft Joliet Level 0 qnx6: invalid mount options. ISO 9660 Extensions: Microsoft Joliet Level 0 qnx6: invalid mount options. ISO 9660 Extensions: Microsoft Joliet Level 0 qnx6: invalid mount options. ISO 9660 Extensions: Microsoft Joliet Level 0 qnx6: invalid mount options. ISO 9660 Extensions: Microsoft Joliet Level 0 ISO 9660 Extensions: Microsoft Joliet Level 0 qnx6: invalid mount options. qnx6: invalid mount options. ISO 9660 Extensions: Microsoft Joliet Level 0 qnx6: invalid mount options. ISO 9660 Extensions: Microsoft Joliet Level 0 qnx6: invalid mount options. ISO 9660 Extensions: Microsoft Joliet Level 0 qnx6: invalid mount options. ISO 9660 Extensions: Microsoft Joliet Level 0 qnx6: invalid mount options. qnx6: invalid mount options. ISO 9660 Extensions: Microsoft Joliet Level 0 qnx6: invalid mount options. ISO 9660 Extensions: Microsoft Joliet Level 0 qnx6: invalid mount options. ISO 9660 Extensions: Microsoft Joliet Level 0 qnx6: invalid mount options. ISO 9660 Extensions: Microsoft Joliet Level 0 ISO 9660 Extensions: Microsoft Joliet Level 0 ISO 9660 Extensions: Microsoft Joliet Level 0 ISO 9660 Extensions: Microsoft Joliet Level 0 ISO 9660 Extensions: Microsoft Joliet Level 0 ISO 9660 Extensions: Microsoft Joliet Level 0 qnx6: invalid mount options. ISO 9660 Extensions: Microsoft Joliet Level 0 qnx6: invalid mount options. ISO 9660 Extensions: Microsoft Joliet Level 0 qnx6: invalid mount options. ISO 9660 Extensions: Microsoft Joliet Level 0 qnx6: invalid mount options. ISO 9660 Extensions: Microsoft Joliet Level 0 ISO 9660 Extensions: Microsoft Joliet Level 0 qnx6: invalid mount options. qnx6: invalid mount options. print_req_error: I/O error, dev loop1, sector 0 qnx6: invalid mount options. print_req_error: I/O error, dev loop1, sector 0 qnx6: invalid mount options. qnx6: invalid mount options. Zero length message leads to an empty skb qnx6: invalid mount options. qnx6: invalid mount options. qnx6: invalid mount options. ISO 9660 Extensions: Microsoft Joliet Level 0 ISO 9660 Extensions: Microsoft Joliet Level 0 ISO 9660 Extensions: Microsoft Joliet Level 0 isofs_fill_super: get root inode failed qnx6: wrong signature (magic) at position (0x2000) - will try alternative position (0x0000). ISO 9660 Extensions: Microsoft Joliet Level 0 ISO 9660 Extensions: Microsoft Joliet Level 0 isofs_fill_super: get root inode failed qnx6: wrong signature (magic) in superblock #1. qnx6: unable to read the first superblock ISO 9660 Extensions: Microsoft Joliet Level 0 isofs_fill_super: get root inode failed print_req_error: I/O error, dev loop1, sector 0 (unnamed net_device) (uninitialized): option active_slave: mode dependency failed, not supported in mode balance-rr(0) ISO 9660 Extensions: Microsoft Joliet Level 0 isofs_fill_super: get root inode failed (unnamed net_device) (uninitialized): option active_slave: mode dependency failed, not supported in mode balance-rr(0) ISO 9660 Extensions: Microsoft Joliet Level 0 print_req_error: I/O error, dev loop1, sector 0 ISO 9660 Extensions: Microsoft Joliet Level 0 isofs_fill_super: get root inode failed (unnamed net_device) (uninitialized): option active_slave: mode dependency failed, not supported in mode balance-rr(0) qnx6: invalid mount options. ISO 9660 Extensions: Microsoft Joliet Level 0 print_req_error: I/O error, dev loop1, sector 0 (unnamed net_device) (uninitialized): option active_slave: mode dependency failed, not supported in mode balance-rr(0) qnx6: invalid mount options. (unnamed net_device) (uninitialized): option active_slave: mode dependency failed, not supported in mode balance-rr(0) ISO 9660 Extensions: Microsoft Joliet Level 0 isofs_fill_super: get root inode failed ISO 9660 Extensions: Microsoft Joliet Level 0 qnx6: invalid mount options. ISO 9660 Extensions: Microsoft Joliet Level 0 qnx6: invalid mount options. ISO 9660 Extensions: Microsoft Joliet Level 0 qnx6: invalid mount options. isofs_fill_super: get root inode failed print_req_error: I/O error, dev loop1, sector 0 ISO 9660 Extensions: Microsoft Joliet Level 0 (unnamed net_device) (uninitialized): option active_slave: mode dependency failed, not supported in mode balance-rr(0) ISO 9660 Extensions: Microsoft Joliet Level 0 ISO 9660 Extensions: Microsoft Joliet Level 0 ISO 9660 Extensions: Microsoft Joliet Level 0 isofs_fill_super: get root inode failed ISO 9660 Extensions: Microsoft Joliet Level 0 ISO 9660 Extensions: Microsoft Joliet Level 0 ISO 9660 Extensions: Microsoft Joliet Level 0 isofs_fill_super: get root inode failed